I understand your goal is to make your paint pop. But the amount of time to polish depends on your starting point. What is the condition of the paint? Swirls? Scractches? Oxidation? Obviously, the worse the condition, the more the polishing time.
There is no stopwatch countdown how long to polish. It comes with experience. For first time machine users, be it DA or rotary, the only way to know how the machine/pad/product combination works without prior experience, is to inspect your progress.
Work the product in using a hatching pattern, up, down, side to side... in a 2'x2' area. Take your time, moving slowly. And wipe off the product and compare the progress to an unpolished section. Good? No? Repeat. After awhile you start to sense how your product combination works. Nice thing about a PC is that you don't have to worry too much about damaging the paint.